Shock-absorber for lighting devices.



- BEST AVAILABLE cbm' R. B. BENJAMIN. SHOCK ABSORBBR FOR LIGHTING DEVICES.

l 1,004,12H.V

APPL'IOATION FILED NOV. 9, 1909.

Patented Sept. 26, i931.

' member has its ends (i, 6 bent outwardly at "rightxapglges with its upright side portions.

.cess-ive vibration is present., If a lighting -p l vBESTAVAILABL C.OP\ UNTTED sTATEs rnTENT oFFIC-E.

REUBEN B. BENJAMIN, 0F CHICAGG, ILLINGIS, ASSIGNOR T BENJAMIN ELECTRIC MANUFACTURING COMPANY, OF CHICAGO, ELLINS, CORORATXON' 0F ILLINOIS.

SHOCK-ABSOR-BER FOR LGHTING DEVICES.

Specicatioa of Letters Yatent. Patented Sept. A26, 1911.

, Application tled- November 9, 1909. Serial No. 527,065.

To all whom it may concern.' of the U-shaped member so as to span the Be it known that I, REUBEN B. BENJA- space between the sideportions of the U- MIN, a citizen of the United States, residing shaped member. This p ate 8 has a downat Chicago, in the county of Cook and State I Wardlyextending' centrally-disposed collar of Illinois, have invented new and use 10 which is internally threaded for the reful Improvements in Shock-Absorbers for i Ceptin 0f the plug ol ppe above mentioned. Lighting Devices, of which the following is i The Uehaped member 5: is formed with a ull, clear, concise and exact description, l reference being had to the accompanying drawing, `forminga art of this specification; This invent-ionre ates to improvements in means for guarding electric lighting` devices and the like from destmctlve vibration l shocks. l l In the use of certain types of electric, lamps, such s, for instance, tungsten filal ment lamps, vit, is found that some means l which passes thesupporting pipe 11 which extends down to and carries Athe .lighting device proper. This pi 11 is arranged to vibrate slightly up an opening in vthe `ll-shaped member and is supported` by a spring 12 which is .coiled about a sleeve 13 into which the -upper end of the pipe 1l screws. The sleeve 13 has se cured at its upper end a rectan ular plate should be provided for absorbing the shocks which would -otherwise be transmitted to i the lamps, and destroy the delicate filaments when'.the lamps are installed in such places as factories and railroad stations, where exabsorbing spring 12 bears. The threaded sleeve 13 is secured in place in the late 14 by flanging the end l?? over upon tiie plate and is prevented from turning in the plate fixture carrying lmetal filament lamps ex- 5 tends downward from the ceilingof a room located beneath heavy machinery, or under i a place where heavy. articles are moved|` about, the vibration of theceiling will in a i short time-,destroy the filaments ofthe lamps. ln the accompanying drawings-Figl ure 1 is a vertical sectional view of the upper portion of'an electric 'lighting fixture 5 to permit the electric lighting fixture carprovided with my improvement; Fi 2 is l ried bythe'device to .swino slightly. This a cross sectional view of the same, ta cen on l feature provides for the safbtv of thelamps the line 2'-2 of Fig. 1 and looking downin case the lower end of the lighting fixture ward; Fig. 3 is a cross sectional view of the be given a side blow, as it permits the lixsame taken on the line 3:-3 of Fig. 1j, look turc to yield somewhat and thus prevent ing upward; and Fig. afs a cross sectional shattering of the delicate filaments of the view on line 4-4 of Fig. 1, looking downy lamps'. ward. lt is customary to conceal the upper'por- In these several figures,`wherein like refl tion of the supportinv pipe for an electric erence numerals are used to designate the lighting fixture, as will as the hickey which same'part throughout, 5 is a U-shaped supv is usually employed. by means of acunopy porting member, preferably formed of a having the form of an inverted bell. This strip of heavy sheet metal. lhisU-shaped canopy is usually sonni-cd directly to the iron supporting pipe of the fixture or to the exterior ornamental casing tube which usually com-culs the iron pipe. W'ere the icanopy 15 of the present device secured directly to the casing tube 16 when the dewhich the -me'tal of the fiange- 13 sinks. 'l`he plate 14 being rcctanoular and Aonly slightly' shorter than the distance between bei' it is evident that the vol-ve, although there is su cient space between the cud of this plate and the member These outturncd ends (i, arcpcrforated for the reception of supporting screws 7. 7 Whenit is desired to secure thc device directly to a ceiling. llVhen. it is desired tov support the dcvi upon' a scre\vthri adcd plugr or the lower end oi' a short section of ipe u plate 8A is secured ut its opposite ends y suitable screws 9, to the outturncd cnd vertical increment of the fixture or the ceiling would cause the upper edge of the canopy to chatter against the ceiling unless the canopy were lowered soun-what an opening in its` lower portion through' vice is lsecured to a ceiling or the like the.

down through the` 14 against which the upper end o the shock- A 14.- when the pipe 11 is screwed thereinto v by forming the plate with notches 13" into the upright portions of the U-shaped vmemlate cannot rey--4 from the ceiling. This would be objectionable and I therefore provide an auxiliary exterior tube 1T, which surrounds the upper end ofthe supporting pipe 11 and the upper end of the tube lt' where these pipes are within the canopy. This tube 17 is secured, near its lower end, to the canopy by a set screw 1S and extends a short distance below' the canopy. The` upper end of this tube is ianged outward sightly at 19 and rests upon the U-Sbaped member 5. lVhen the lighting fixture or the ceilingr vibrate vertically, the pipes 11 and lt are permitted to slide up and down relativelyto the tube 1T,

ing tixtnre is present to compress the spring 1Q. The spring 1Q is made of such length and strength as to balance the Weightivof the fixture with the top of the plate 14 slightly below the serewslfl, or about as seen in Fig. 1.

It will be seen that with the plate S removed and discarded the device 'may be used in place ot the ordinary crowfoot support,

and that with the plate 8 in place the device may be screwed upon the ordinary insulated support, the device then serving as a hictrey. y

Having thusI described my invention, what I' claim as new and desire to secure by Letters Patenti, is: y

i. In a shock absorber for lighting fixtures, the combination of a support having BEST AVAILABLE COPY an opening, a sleeve internally .threaded for the reception of the fixture pipe. a coiled spring resting upon said support and .sus-

taimng' said sleeve, means for preventing rotation of said sleeve in said 'opt-ning, a tubular member extending downward from said support and surrounding the tixture pipe. and a canopy secured tosaid tubular member.A

2. ln a shock absorber for lighting lixtures` the combination of a Supporting member. an internally threaded sleeve haviingIr vertical movement in'said supporting member, a spring for sustaining said sleeve, a tubular member extending downward from said supporting member, and a canopy secured to said tubular member.

3. ln a shock absorber for lightingr tixtures, the eombinatipn'of a .supporting member. an yinternalb threaded Sleeve, a spring supported by lsaid supportilngr member and sustainingsaid sleeve. a canopy` and means extending downward from .said .supporting member for sustaining saidicanolrv.

4. In a shock absorber for lighting lixtnres, the combination of a supporting memlier, a spring sustained thereby, a pipereceiving member sustained by said spring,

means for preventing;l rotation of said pipesupportingr member, and a canopy-supportl mgmember secured to said hrstfnamed supporting member and arranged to permit,

vertical movement ot' .said pipeaeceivin,r member with respect to the canop.v

ln witnesspvllereof, I have hereunto subv'scribed my naine in` the presence' of two Cuarta-:s (i. C( ira,

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